class_docstr: Stacked Bar graph class
docstr: Separate values between positives and negatives stacked
docstr_tok: ["Separate","values","between","positives","and","negatives","stacked"]
code: def _get_separated_values(self, secondary=False):
      """Separate values between positives and negatives stacked"""
      series = self.secondary_series if secondary else self.series
      transposed = list(zip(*[serie.values for serie in series]))
      positive_vals = [
          sum(
              [
                  val
                  for val in vals
                  if val is not None and val >= self.zero
              ]
          )
          for vals in transposed
      ]
      negative_vals = [
          sum(
              [
                  val
                  for val in vals
                  if val is not None and val < self.zero
              ]
          )
          for vals in transposed
      ]
      return positive_vals, negative_vals
  
file_path: pygal/pygal/graph/stackedbar.py
imports: from pygal.adapters import none_to_zero
  from pygal.graph.bar import Bar
label_desc: Use image node_id 1 for calling the StackedBar obj's underlying member method code with example usage: obj._get_separated_values(secondary) and returns: positive_vals,  negative_vals